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<?php
/**
* Class Minify_CSS_UriRewriter
* @package Minify
*/
/**
* Rewrite file-relative URIs as root-relative in CSS files
*
* @package Minify
* @author Stephen Clay <steve@mrclay.org>
*/
class Minify_CSS_UriRewriter {
/**
* rewrite() and rewriteRelative() append debugging information here
*
* @var string
*/
public static $debugText = '';
/**
* In CSS content, rewrite file relative URIs as root relative
*
* @param string $css
*
* @param string $currentDir The directory of the current CSS file.
*
* @param string $docRoot The document root of the web site in which
* the CSS file resides (default = $_SERVER['DOCUMENT_ROOT']).
*
* @param array $symlinks (default = array()) If the CSS file is stored in
* a symlink-ed directory, provide an array of link paths to
* target paths, where the link paths are within the document root. Because
* paths need to be normalized for this to work, use "//" to substitute
* the doc root in the link paths (the array keys). E.g.:
* <code>
* array('//symlink' => '/real/target/path') // unix
* array('//static' => 'D:\\staticStorage') // Windows
* </code>
*
* @return string
*/
public static function rewrite($css, $currentDir, $docRoot = null, $symlinks = array())
{
self::$_docRoot = self::_realpath(
$docRoot ? $docRoot : $_SERVER['DOCUMENT_ROOT']
);
self::$_currentDir = self::_realpath($currentDir);
self::$_symlinks = array();
// normalize symlinks
foreach ($symlinks as $link => $target) {
$link = ($link === '//')
? self::$_docRoot
: str_replace('//', self::$_docRoot . '/', $link);
$link = strtr($link, '/', DIRECTORY_SEPARATOR);
self::$_symlinks[$link] = self::_realpath($target);
}
self::$debugText .= "docRoot : " . self::$_docRoot . "\n"
. "currentDir : " . self::$_currentDir . "\n";
if (self::$_symlinks) {
self::$debugText .= "symlinks : " . var_export(self::$_symlinks, 1) . "\n";
}
self::$debugText .= "\n";
$css = self::_trimUrls($css);
// rewrite
$css = preg_replace_callback('/@import\\s+([\'"])(.*?)[\'"]/'
,array(self::$className, '_processUriCB'), $css);
$css = preg_replace_callback('/url\\(\\s*([^\\)\\s]+)\\s*\\)/'
,array(self::$className, '_processUriCB'), $css);
return $css;
}
/**
* In CSS content, prepend a path to relative URIs
*
* @param string $css
*
* @param string $path The path to prepend.
*
* @return string
*/
public static function prepend($css, $path)
{
self::$_prependPath = $path;
$css = self::_trimUrls($css);
// append
$css = preg_replace_callback('/@import\\s+([\'"])(.*?)[\'"]/'
,array(self::$className, '_processUriCB'), $css);
$css = preg_replace_callback('/url\\(\\s*([^\\)\\s]+)\\s*\\)/'
,array(self::$className, '_processUriCB'), $css);
self::$_prependPath = null;
return $css;
}
/**
* Get a root relative URI from a file relative URI
*
* <code>
* Minify_CSS_UriRewriter::rewriteRelative(
* '../img/hello.gif'
* , '/home/user/www/css' // path of CSS file
* , '/home/user/www' // doc root
* );
* // returns '/img/hello.gif'
*
* // example where static files are stored in a symlinked directory
* Minify_CSS_UriRewriter::rewriteRelative(
* 'hello.gif'
* , '/var/staticFiles/theme'
* , '/home/user/www'
* , array('/home/user/www/static' => '/var/staticFiles')
* );
* // returns '/static/theme/hello.gif'
* </code>
*
* @param string $uri file relative URI
*
* @param string $realCurrentDir realpath of the current file's directory.
*
* @param string $realDocRoot realpath of the site document root.
*
* @param array $symlinks (default = array()) If the file is stored in
* a symlink-ed directory, provide an array of link paths to
* real target paths, where the link paths "appear" to be within the document
* root. E.g.:
* <code>
* array('/home/foo/www/not/real/path' => '/real/target/path') // unix
* array('C:\\htdocs\\not\\real' => 'D:\\real\\target\\path') // Windows
* </code>
*
* @return string
*/
public static function rewriteRelative($uri, $realCurrentDir, $realDocRoot, $symlinks = array())
{
// prepend path with current dir separator (OS-independent)
$path = strtr($realCurrentDir, '/', DIRECTORY_SEPARATOR)
. DIRECTORY_SEPARATOR . strtr($uri, '/', DIRECTORY_SEPARATOR);
self::$debugText .= "file-relative URI : {$uri}\n"
. "path prepended : {$path}\n";
// "unresolve" a symlink back to doc root
foreach ($symlinks as $link => $target) {
if (0 === strpos($path, $target)) {
// replace $target with $link
$path = $link . substr($path, strlen($target));
self::$debugText .= "symlink unresolved : {$path}\n";
break;
}
}
// strip doc root
$path = substr($path, strlen($realDocRoot));
self::$debugText .= "docroot stripped : {$path}\n";
// fix to root-relative URI
$uri = strtr($path, '/\\', '//');
$uri = self::removeDots($uri);
self::$debugText .= "traversals removed : {$uri}\n\n";
return $uri;
}
/**
* Remove instances of "./" and "../" where possible from a root-relative URI
*
* @param string $uri
*
* @return string
*/
public static function removeDots($uri)
{
$uri = str_replace('/./', '/', $uri);
// inspired by patch from Oleg Cherniy
do {
$uri = preg_replace('@/[^/]+/\\.\\./@', '/', $uri, 1, $changed);
} while ($changed);
return $uri;
}
/**
* Defines which class to call as part of callbacks, change this
* if you extend Minify_CSS_UriRewriter
*
* @var string
*/
protected static $className = 'Minify_CSS_UriRewriter';
/**
* Get realpath with any trailing slash removed. If realpath() fails,
* just remove the trailing slash.
*
* @param string $path
*
* @return mixed path with no trailing slash
*/
protected static function _realpath($path)
{
$realPath = realpath($path);
if ($realPath !== false) {
$path = $realPath;
}
return rtrim($path, '/\\');
}
/**
* Directory of this stylesheet
*
* @var string
*/
private static $_currentDir = '';
/**
* DOC_ROOT
*
* @var string
*/
private static $_docRoot = '';
/**
* directory replacements to map symlink targets back to their
* source (within the document root) E.g. '/var/www/symlink' => '/var/realpath'
*
* @var array
*/
private static $_symlinks = array();
/**
* Path to prepend
*
* @var string
*/
private static $_prependPath = null;
/**
* @param string $css
*
* @return string
*/
private static function _trimUrls($css)
{
return preg_replace('/
url\\( # url(
\\s*
([^\\)]+?) # 1 = URI (assuming does not contain ")")
\\s*
\\) # )
/x', 'url($1)', $css);
}
/**
* @param array $m
*
* @return string
*/
private static function _processUriCB($m)
{
// $m matched either '/@import\\s+([\'"])(.*?)[\'"]/' or '/url\\(\\s*([^\\)\\s]+)\\s*\\)/'
$isImport = ($m[0][0] === '@');
// determine URI and the quote character (if any)
if ($isImport) {
$quoteChar = $m[1];
$uri = $m[2];
} else {
// $m[1] is either quoted or not
$quoteChar = ($m[1][0] === "'" || $m[1][0] === '"')
? $m[1][0]
: '';
$uri = ($quoteChar === '')
? $m[1]
: substr($m[1], 1, strlen($m[1]) - 2);
}
// analyze URI
if ('/' !== $uri[0] // root-relative
&& false === strpos($uri, '//') // protocol (non-data)
&& 0 !== strpos($uri, 'data:') // data protocol
) {
// URI is file-relative: rewrite depending on options
if (self::$_prependPath === null) {
$uri = self::rewriteRelative($uri, self::$_currentDir, self::$_docRoot, self::$_symlinks);
} else {
$uri = self::$_prependPath . $uri;
if ($uri[0] === '/') {
$root = '';
$rootRelative = $uri;
$uri = $root . self::removeDots($rootRelative);
} elseif (preg_match('@^((https?\:)?//([^/]+))/@', $uri, $m) && (false !== strpos($m[3], '.'))) {
$root = $m[1];
$rootRelative = substr($uri, strlen($root));
$uri = $root . self::removeDots($rootRelative);
}
}
}
return $isImport
? "@import {$quoteChar}{$uri}{$quoteChar}"
: "url({$quoteChar}{$uri}{$quoteChar})";
}
}
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